Merge "profcollectd: add interface to wait for ETM after boot." am: d9d70c8fb6 am: bf0b895c05 am: 4e7acdc17a am: 2da0875e15

Original change: https://android-review.googlesource.com/c/platform/system/extras/+/1944289

Change-Id: I6d2ea705be0901b144dbc92f7a8ca190c5d461d6